Summary of Significant Accounting Policies (Devaluation of Venezuelan Bolivar) (Details) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014 Venezuelan Bolivar [Member] USD ($)	Mar. 31, 2013 Venezuelan Bolivar [Member] USD ($)	Dec. 31, 2014 Venezuelan Bolivar [Member] USD ($)	Dec. 31, 2013 Venezuelan Bolivar [Member] USD ($)	Feb. 13, 2013 Venezuelan Bolivar [Member] VEB	Feb. 12, 2013 Venezuelan Bolivar [Member] VEB	Dec. 31, 2014 Venezuela [Member] USD ($)	Dec. 31, 2014 SICAD II [Member] Venezuelan Bolivar [Member] VEB
Impact of Foreign Currency Devaluation [Line Items]
Amount Recognized in Income Due to Inflationary Accounting, Net of Tax	$ (245)		$ (252)	$ (94)
Foreign Currency Exchange Rate, Translation					6.30	4.30		50
Currency devaluation expense		100	245	100
Net investment in foreign country							361
Net monetary asset position							$ 36